{
  "url": "https://openlegislation.uk/eu-regulation-2017-1485/article-15",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1485/article-15.json",
  "legislation": "eur/2017/1485",
  "legislation_title": "Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-1485",
  "path": "article/15",
  "kind": "article",
  "number": "15",
  "heading": "Annual report on operational security indicators",
  "text": "1. By 30 September, the transmission system operator shall publish an annual report based on the incidents classification scale adopted in accordance with Article 30(1)(i) of Regulation (EU) 2019/943 as that provision applied in EU law immediately before IP completion day. The regulatory authority may provide its opinion on the format and contents of that annual report, including the geographical scope of the incidents reported ... and any relevant historical information.\n2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\n3. The annual reports referred to in paragraph 1 shall contain at least the following operational security indicators relevant to operational security:\n(a) number of tripped transmission system elements per year per TSO;\n(b) number of tripped power generation facilities per year per TSO;\n(c) energy not supplied per year due to unscheduled disconnection of demand facilities per TSO;\n(d) time duration and number of instances of being in the alert and emergency states per TSO;\n(e) time duration and number of events within which there was a lack of reserves identified per TSO;\n(f) time duration and number of voltage deviations exceeding the ranges from Tables 1 and 2 of Annex II per TSO;\n(g) number of minutes outside the standard frequency range and number of minutes outside the 50 % of maximum steady state frequency deviation per synchronous area;\n(h) number of system-split separations or local blackout states; and\n(i) number of blackouts involving two or more TSOs.\n4. The annual report referred to in paragraph 1 shall contain the following operational security indicators relevant to operational planning:\n(a) number of events in which an incident contained in the contingency list led to a degradation of the system operation state;\n(b) number of the events referred to in point (a) in which a degradation of system operation conditions occurred as a result of unexpected discrepancies from load or generation forecasts;\n(c) number of events in which there was a degradation in system operation conditions due to an exceptional contingency;\n(d) number of the events referred to in point (c) in which a degradation of system operation conditions occurred as a result of unexpected discrepancies from load or generation forecasts; and\n(e) number of events leading to a degradation in system operation conditions due to lack of active power reserves.\n5. The annual reports shall contain explanations of the reasons for incidents at the operational security ranking scales 2 and 3 as per the incidents classification scale referred to in paragraph 1. Those explanations shall be based on an investigation of the incidents by TSOs which process shall be set out in the incidents classification scale. TSOs shall inform the regulatory authority about an investigation in due time before it is launched. The regulatory authority may be involved in the investigation upon its request.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Art. 15(1) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(2)(a)(i) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in Art. 15 substituted (E.W.S.) (1.10.2024) by The Energy Act 2023 (Consequential Amendments) Regulations 2024 (S.I. 2024/706), regs. 1(1), 44(b); S.I. 2024/957, reg. 2(a)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Words in Art. 15(1) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(2)(b)(i) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)(3)(g)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F4",
      "text": "Words in Art. 15(1) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(2)(b)(i) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F5",
      "text": "Words in Art. 15(1) omitted (E.W.S.) (31.12.2020) by virtue of The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(2)(b)(ii) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F6",
      "text": "Art. 15(2) omitted (E.W.S.) (31.12.2020) by virtue of The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(3) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F7",
      "text": "Words in Art. 15(5) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(4)(a) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F8",
      "text": "Words in Art. 15(5) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(4)(b) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F9",
      "text": "Words in Art. 15(5) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(4)(c)(i) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F10",
      "text": "Word in Art. 15(5) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 16(4)(c)(ii) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/1485/article/15",
    "retrieved_at": "2026-11-01T14:44:42.168103+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}